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<?php
/**
* Base class for all GIS data type classes
*/
declare(strict_types=1);
namespace PhpMyAdmin\Gis;
use PhpMyAdmin\Image\ImageWrapper;
use TCPDF;
use function explode;
use function floatval;
use function mb_strripos;
use function mb_substr;
use function mt_getrandmax;
use function preg_match;
use function random_int;
use function sprintf;
use function str_replace;
use function trim;
/**
* Base class for all GIS data type classes.
*/
abstract class GisGeometry
{
/**
* Prepares and returns the code related to a row in the GIS dataset as SVG.
*
* @param string $spatial GIS data object
* @param string $label label for the GIS data object
* @param string $color color for the GIS data object
* @param array $scale_data data related to scaling
*
* @return string the code related to a row in the GIS dataset
*/
abstract public function prepareRowAsSvg($spatial, $label, $color, array $scale_data);
/**
* Adds to the PNG image object, the data related to a row in the GIS dataset.
*
* @param string $spatial GIS POLYGON object
* @param string|null $label Label for the GIS POLYGON object
* @param string $color Color for the GIS POLYGON object
* @param array $scale_data Array containing data related to scaling
*/
abstract public function prepareRowAsPng(
$spatial,
?string $label,
$color,
array $scale_data,
ImageWrapper $image
): ImageWrapper;
/**
* Adds to the TCPDF instance, the data related to a row in the GIS dataset.
*
* @param string $spatial GIS data object
* @param string|null $label label for the GIS data object
* @param string $color color for the GIS data object
* @param array $scale_data array containing data related to scaling
* @param TCPDF $pdf TCPDF instance
*
* @return TCPDF the modified TCPDF instance
*/
abstract public function prepareRowAsPdf(
$spatial,
?string $label,
$color,
array $scale_data,
$pdf
);
/**
* Prepares the JavaScript related to a row in the GIS dataset
* to visualize it with OpenLayers.
*
* @param string $spatial GIS data object
* @param int $srid spatial reference ID
* @param string $label label for the GIS data object
* @param array $color color for the GIS data object
* @param array $scale_data array containing data related to scaling
*
* @return string the JavaScript related to a row in the GIS dataset
*/
abstract public function prepareRowAsOl(
$spatial,
int $srid,
$label,
$color,
array $scale_data
);
/**
* Scales each row.
*
* @param string $spatial spatial data of a row
*
* @return array array containing the min, max values for x and y coordinates
*/
abstract public function scaleRow($spatial);
/**
* Generates the WKT with the set of parameters passed by the GIS editor.
*
* @param array $gis_data GIS data
* @param int $index index into the parameter object
* @param string|null $empty value for empty points
*
* @return string WKT with the set of parameters passed by the GIS editor
*/
abstract public function generateWkt(array $gis_data, $index, $empty = '');
/**
* Returns OpenLayers.Bounds object that correspond to the bounds of GIS data.
*
* @param int $srid spatial reference ID
* @param array $scale_data data related to scaling
*
* @return string OpenLayers.Bounds object that
* correspond to the bounds of GIS data
*/
protected function getBoundsForOl(int $srid, array $scale_data)
{
return sprintf(
'var minLoc = [%s, %s];'
. 'var maxLoc = [%s, %s];'
. 'var ext = ol.extent.boundingExtent([minLoc, maxLoc]);'
. 'ext = ol.proj.transformExtent(ext, ol.proj.get("EPSG:%s"), ol.proj.get(\'EPSG:3857\'));'
. 'map.getView().fit(ext, map.getSize());',
$scale_data['minX'],
$scale_data['minY'],
$scale_data['maxX'],
$scale_data['maxY'],
$srid
);
}
/**
* Updates the min, max values with the given point set.
*
* @param string $point_set point set
* @param array $min_max existing min, max values
*
* @return array the updated min, max values
*/
protected function setMinMax($point_set, array $min_max)
{
// Separate each point
$points = explode(',', $point_set);
foreach ($points as $point) {
// Extract coordinates of the point
$cordinates = explode(' ', $point);
$x = (float) $cordinates[0];
if (! isset($min_max['maxX']) || $x > $min_max['maxX']) {
$min_max['maxX'] = $x;
}
if (! isset($min_max['minX']) || $x < $min_max['minX']) {
$min_max['minX'] = $x;
}
$y = (float) $cordinates[1];
if (! isset($min_max['maxY']) || $y > $min_max['maxY']) {
$min_max['maxY'] = $y;
}
if (isset($min_max['minY']) && $y >= $min_max['minY']) {
continue;
}
$min_max['minY'] = $y;
}
return $min_max;
}
/**
* Generates parameters for the GIS data editor from the value of the GIS column.
* This method performs common work.
* More specific work is performed by each of the geom classes.
*
* @param string $value value of the GIS column
*
* @return array parameters for the GIS editor from the value of the GIS column
*/
public function generateParams($value)
{
$geom_types = '(POINT|MULTIPOINT|LINESTRING|MULTILINESTRING|POLYGON|MULTIPOLYGON|GEOMETRYCOLLECTION)';
$srid = 0;
$wkt = '';
if (preg_match("/^'" . $geom_types . "\(.*\)',[0-9]*$/i", $value)) {
$last_comma = mb_strripos($value, ',');
$srid = (int) trim(mb_substr($value, $last_comma + 1));
$wkt = trim(mb_substr($value, 1, $last_comma - 2));
} elseif (preg_match('/^' . $geom_types . '\(.*\)$/i', $value)) {
$wkt = $value;
}
return [
'srid' => $srid,
'wkt' => $wkt,
];
}
/**
* Extracts points, scales and returns them as an array.
*
* @param string $point_set string of comma separated points
* @param array|null $scale_data data related to scaling
* @param bool $linear if true, as a 1D array, else as a 2D array
*
* @return array scaled points
*/
protected function extractPoints($point_set, $scale_data, $linear = false): array
{
$points_arr = [];
// Separate each point
$points = explode(',', $point_set);
foreach ($points as $point) {
$point = str_replace(['(', ')'], '', $point);
// Extract coordinates of the point
$coordinates = explode(' ', $point);
if (isset($coordinates[0], $coordinates[1]) && trim($coordinates[0]) != '' && trim($coordinates[1]) != '') {
if ($scale_data != null) {
$x = ($coordinates[0] - $scale_data['x']) * $scale_data['scale'];
$y = $scale_data['height']
- ($coordinates[1] - $scale_data['y']) * $scale_data['scale'];
} else {
$x = floatval(trim($coordinates[0]));
$y = floatval(trim($coordinates[1]));
}
} else {
$x = 0;
$y = 0;
}
if (! $linear) {
$points_arr[] = [
$x,
$y,
];
} else {
$points_arr[] = $x;
$points_arr[] = $y;
}
}
return $points_arr;
}
/**
* Generates JavaScript for adding an array of polygons to OpenLayers.
*
* @param array $polygons x and y coordinates for each polygon
* @param int $srid spatial reference id
*
* @return string JavaScript for adding an array of polygons to OpenLayers
*/
protected function getPolygonArrayForOpenLayers(array $polygons, int $srid)
{
$ol_array = 'var polygonArray = [];';
foreach ($polygons as $polygon) {
$rings = explode('),(', $polygon);
$ol_array .= $this->getPolygonForOpenLayers($rings, $srid);
$ol_array .= 'polygonArray.push(polygon);';
}
return $ol_array;
}
/**
* Generates JavaScript for adding points for OpenLayers polygon.
*
* @param array $polygon x and y coordinates for each line
* @param int $srid spatial reference id
*
* @return string JavaScript for adding points for OpenLayers polygon
*/
protected function getPolygonForOpenLayers(array $polygon, int $srid)
{
return $this->getLineArrayForOpenLayers($polygon, $srid, false)
. 'var polygon = new ol.geom.Polygon(arr);';
}
/**
* Generates JavaScript for adding an array of LineString
* or LineRing to OpenLayers.
*
* @param array $lines x and y coordinates for each line
* @param int $srid spatial reference id
* @param bool $is_line_string whether it's an array of LineString
*
* @return string JavaScript for adding an array of LineString
* or LineRing to OpenLayers
*/
protected function getLineArrayForOpenLayers(
array $lines,
int $srid,
$is_line_string = true
) {
$ol_array = 'var arr = [];';
foreach ($lines as $line) {
$ol_array .= 'var lineArr = [];';
$points_arr = $this->extractPoints($line, null);
$ol_array .= 'var line = ' . $this->getLineForOpenLayers($points_arr, $srid, $is_line_string) . ';';
$ol_array .= 'var coord = line.getCoordinates();';
$ol_array .= 'for (var i = 0; i < coord.length; i++) lineArr.push(coord[i]);';
$ol_array .= 'arr.push(lineArr);';
}
return $ol_array;
}
/**
* Generates JavaScript for adding a LineString or LineRing to OpenLayers.
*
* @param array $points_arr x and y coordinates for each point
* @param int $srid spatial reference id
* @param bool $is_line_string whether it's a LineString
*
* @return string JavaScript for adding a LineString or LineRing to OpenLayers
*/
protected function getLineForOpenLayers(
array $points_arr,
int $srid,
$is_line_string = true
) {
return 'new ol.geom.'
. ($is_line_string ? 'LineString' : 'LinearRing') . '('
. $this->getPointsArrayForOpenLayers($points_arr, $srid)
. ')';
}
/**
* Generates JavaScript for adding an array of points to OpenLayers.
*
* @param array $points_arr x and y coordinates for each point
* @param int $srid spatial reference id
*
* @return string JavaScript for adding an array of points to OpenLayers
*/
protected function getPointsArrayForOpenLayers(array $points_arr, int $srid)
{
$ol_array = 'new Array(';
foreach ($points_arr as $point) {
$ol_array .= $this->getPointForOpenLayers($point, $srid) . '.getCoordinates(), ';
}
$ol_array = mb_substr($ol_array, 0, -2);
return $ol_array . ')';
}
/**
* Generates JavaScript for adding a point to OpenLayers.
*
* @param array $point array containing the x and y coordinates of the point
* @param int $srid spatial reference id
*
* @return string JavaScript for adding points to OpenLayers
*/
protected function getPointForOpenLayers(array $point, int $srid)
{
return '(new ol.geom.Point([' . $point[0] . ',' . $point[1] . '])'
. '.transform(ol.proj.get("EPSG:' . $srid . '")'
. ', ol.proj.get(\'EPSG:3857\')))';
}
protected function getRandomId(): int
{
return random_int(0, mt_getrandmax());
}
}